Air-duct



FIG. 1 is a perspective view of an air-duct showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of the air-duct of FIG. 1 in a use configuration;

FIG. 9 is a front view of FIG. 8;

FIG. 10 is a rear view of FIG. 8;

FIG. 11 is a left side view of FIG. 8;

FIG. 12 is a right side view of FIG. 8;

FIG. 13 is a top view of FIG. 8; and,

FIG. 14 is a rear view of FIG. 8. 

CLAIM The ornamental design for an air-duct, as shown and described. 